diff --git a/app.js b/app.js
index c457b5b..43fc7e4 100644
--- a/app.js
+++ b/app.js
@@ -8,6 +8,10 @@
 
   const $ = id => document.getElementById(id);
 
+  if (location.search.includes('debug')) {
+    document.body.classList.add('debug-mode');
+  }
+
   /* ─── Screen routing ─── */
   function show(name) {
     ['start','host','join','game','result'].forEach(s =>
@@ -179,7 +183,15 @@
     mesh.onpeerdisconnect = () => {
       renderPlayers('host-player-list');
     };
-    mesh.onqrupdate = d => showQR('qr-host', d);
+    mesh.onqrupdate = d => {
+      showQR('qr-host', d);
+      const raw = $('host-qr-raw');
+      if (raw) raw.textContent = d;
+      const codeEl = $('host-room-code');
+      if (codeEl && mesh.roomCode) codeEl.textContent = mesh.roomCode;
+      const fullSDP = mesh.getFullSDPData ? mesh.getFullSDPData() : null;
+      if (fullSDP) showQR('qr-host-full', fullSDP);
+    };
     mesh.onreadyupdate = (ready, total) => {
       $('btn-start-game').disabled = ready < total || total === 0;
     };
@@ -212,6 +224,19 @@
     }
   });
 
+  $('btn-host-answer-paste').addEventListener('click', () => {
+    const raw = $('host-answer-paste').value.trim();
+    if (!raw) return;
+    if (!mesh) return;
+    try { JSON.parse(raw); } catch (e) {
+      $('host-scan-status').textContent = 'Ungültiges JSON';
+      return;
+    }
+    mesh.feedAnswer(raw);
+    $('host-answer-paste').value = '';
+    $('host-scan-status').textContent = 'Verbunden!';
+  });
+
   /* ─── Join screen ─── */
   $('btn-join').addEventListener('click', async () => {
     role = 'peer';
@@ -243,16 +268,41 @@
       let scanned = false;
       camScan('join-camera', 'join-camera-canvas', (parsed, raw) => {
         if (scanned) return;
-        if (!parsed.s || !parsed.id) return;
+        if (!parsed.id) return;
         scanned = true;
         $('join-scan-status').textContent = 'Verbinde...';
-        mesh.joinFromQR(raw);
+        if (parsed.room) {
+          $('join-room-input').value = parsed.room;
+          mesh.joinFromRoomCode(parsed.room);
+        } else if (parsed.s) {
+          mesh.joinFromQR(raw);
+        }
       });
     } catch (e) {
       $('join-scan-status').textContent = 'Kamera nicht verfügbar';
     }
   });
 
+  $('btn-join-qr-paste').addEventListener('click', () => {
+    const raw = $('join-qr-paste').value.trim();
+    if (!raw) return;
+    if (!mesh) { show('start'); return; }
+    try { JSON.parse(raw); } catch (e) { return; }
+    mesh.joinFromQR(raw);
+    $('join-qr-paste').value = '';
+    $('join-scan-status').textContent = 'Verbinde...';
+  });
+
+  $('btn-join-room').addEventListener('click', () => {
+    const code = $('join-room-input').value.trim().toUpperCase();
+    if (!code) return;
+    if (!mesh) { show('start'); return; }
+    camStop();
+    $('join-scan-status').textContent = 'Verbinde...';
+    $('join-camera').classList.remove('active');
+    mesh.joinFromRoomCode(code);
+  });
+
   /* ─── Host: start game button (in host screen) ─── */
   $('btn-start-game').addEventListener('click', () => {
     setupGame(false);
diff --git a/index.html b/index.html
index fd74221..f851d63 100644
--- a/index.html
+++ b/index.html
@@ -28,6 +28,11 @@
         <div id="qr-host"></div>
         <p class="hint">Scannen lassen, um beizutreten</p>
       </div>
+      <div class="room-code debug-only">
+        <span class="room-code-label">Raum-Code</span>
+        <span class="room-code-value" id="host-room-code"></span>
+        <p class="hint">Auf gleichem Rechner: Code in anderem Tab eingeben</p>
+      </div>
       <div id="host-players" class="player-section">
         <h3>Spieler</h3>
         <ul id="host-player-list" class="player-list"></ul>
@@ -37,6 +42,19 @@
         <video id="host-camera" autoplay playsinline muted></video>
         <canvas id="host-camera-canvas" hidden></canvas>
         <p id="host-scan-status"></p>
+        <details class="debug-helper debug-only">
+          <summary>QR-Rohdaten</summary>
+          <pre id="host-qr-raw" class="raw-data"></pre>
+        </details>
+        <details class="debug-helper debug-only">
+          <summary>Antwort manuell einfügen</summary>
+          <textarea id="host-answer-paste" rows="3" placeholder="Antwort-JSON hier einfügen..."></textarea>
+          <button id="btn-host-answer-paste" class="btn-small">Antwort einspielen</button>
+        </details>
+        <details class="debug-helper debug-only">
+          <summary>Full-SDP-QR (für andere Geräte)</summary>
+          <div id="qr-host-full"></div>
+        </details>
       </div>
       <button id="btn-start-game" class="btn-primary" disabled>Münzwurf starten</button>
     </div>
@@ -50,6 +68,15 @@
         <video id="join-camera" autoplay playsinline muted></video>
         <canvas id="join-camera-canvas" hidden></canvas>
         <p id="join-scan-status">QR-Code scannen...</p>
+        <div class="debug-only" style="margin-top:12px">
+          <input id="join-room-input" type="text" placeholder="Raum-Code" maxlength="4" style="width:100px;padding:10px;text-align:center;font-size:1.2rem;font-family:monospace;text-transform:uppercase;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text)">
+          <button id="btn-join-room" class="btn-small" style="margin-top:8px">Beitreten</button>
+        </div>
+        <details class="debug-helper debug-only">
+          <summary>QR manuell einfügen</summary>
+          <textarea id="join-qr-paste" rows="3" placeholder="QR-JSON hier einfügen..."></textarea>
+          <button id="btn-join-qr-paste" class="btn-small">Beitreten</button>
+        </details>
       </div>
       <div id="join-answer-section" hidden>
         <p>Antwort-QR für den Host:</p>
diff --git a/p2p.js b/p2p.js
index 2144ab3..d36a51d 100644
--- a/p2p.js
+++ b/p2p.js
@@ -5,11 +5,15 @@ class MeshNet {
     this._pendingMeshPeers = new Map();
     this._pendingPeer = null;
     this._currentQRData = null;
+    this._fullSDPData = null;
     this.isHost = false;
     this.hostPeerId = null;
     this.roster = [];
     this.readyPeers = new Set();
     this._meshReadySent = false;
+    this.roomCode = null;
+    this._processedAnswers = new Set();
+    this._answerPollInterval = null;
 
     this.onpeerconnect = null;
     this.onpeerdisconnect = null;
@@ -19,11 +23,59 @@ class MeshNet {
     this.onreadyupdate = null;
   }
 
+  _generateRoomCode() {
+    return Math.random().toString(36).substring(2, 6).toUpperCase();
+  }
+
+  _startAnswerPolling() {
+    this._stopAnswerPolling();
+    this._answerPollInterval = setInterval(() => {
+      if (!this.isHost || !this.roomCode || !this._pendingPeer || this._pendingPeer.signalReceived) return;
+      const prefix = `rp2p_answer_${this.roomCode}_`;
+      for (let i = 0; i < localStorage.length; i++) {
+        const key = localStorage.key(i);
+        if (key && key.startsWith(prefix) && !this._processedAnswers.has(key)) {
+          this._processedAnswers.add(key);
+          try {
+            const raw = localStorage.getItem(key);
+            if (!raw) continue;
+            const data = JSON.parse(raw);
+            this.feedAnswer(JSON.stringify({ v: 1, id: data.id, s: data.s }));
+          } catch (err) {
+            console.error('poll answer error:', err);
+          }
+        }
+      }
+    }, 400);
+  }
+
+  _stopAnswerPolling() {
+    if (this._answerPollInterval) {
+      clearInterval(this._answerPollInterval);
+      this._answerPollInterval = null;
+    }
+  }
+
   /* ─── Host: room ─── */
 
   createRoom() {
     this.isHost = true;
+    this.roomCode = this._generateRoomCode();
+    this._processedAnswers = new Set();
+    this._cleanupStorage();
     this._createPendingPeer();
+    this._startAnswerPolling();
+  }
+
+  _cleanupStorage() {
+    const toRemove = [];
+    for (let i = 0; i < localStorage.length; i++) {
+      const key = localStorage.key(i);
+      if (key && (key.startsWith('rp2p_offer_') || key.startsWith('rp2p_answer_'))) {
+        toRemove.push(key);
+      }
+    }
+    toRemove.forEach(k => localStorage.removeItem(k));
   }
 
   _createPendingPeer() {
@@ -31,13 +83,23 @@ class MeshNet {
       try { this._pendingPeer.peer.destroy(); } catch (e) {}
     }
 
-    const peer = new SimplePeer({ initiator: true, trickle: false });
+    const peer = new SimplePeer({ initiator: true, trickle: false, config: { iceServers: [] } });
     let signalSent = false;
 
     peer.on('signal', signal => {
       if (signalSent) return;
       signalSent = true;
-      this._currentQRData = JSON.stringify({ v: 1, id: this.myPeerId, s: signal });
+
+      const sdpJson = JSON.stringify({ v: 1, id: this.myPeerId, s: signal });
+      this._fullSDPData = sdpJson;
+
+      if (this.roomCode) {
+        localStorage.setItem(`rp2p_offer_${this.roomCode}`, sdpJson);
+        this._currentQRData = JSON.stringify({ v: 1, id: this.myPeerId, room: this.roomCode });
+      } else {
+        this._currentQRData = sdpJson;
+      }
+
       if (this.onqrupdate) this.onqrupdate(this._currentQRData);
     });
 
@@ -80,7 +142,7 @@ class MeshNet {
     this.hostPeerId = remoteId;
     const offer = data.s;
 
-    const peer = new SimplePeer({ initiator: false, trickle: false });
+    const peer = new SimplePeer({ initiator: false, trickle: false, config: { iceServers: [] } });
     let answerSent = false;
 
     peer.on('signal', signal => {
@@ -113,10 +175,53 @@ class MeshNet {
     this._pendingPeer = { peer, peerId: remoteId, connected: answerSent };
   }
 
+  joinFromRoomCode(code) {
+    const key = `rp2p_offer_${code.toUpperCase()}`;
+    const offerStr = localStorage.getItem(key);
+    if (!offerStr) {
+      console.error('Room not found:', code);
+      return;
+    }
+    const offerData = JSON.parse(offerStr);
+    const remoteId = offerData.id;
+    this.hostPeerId = remoteId;
+    const offer = offerData.s;
+
+    const peer = new SimplePeer({ initiator: false, trickle: false, config: { iceServers: [] } });
+    let answerSent = false;
+
+    peer.on('signal', signal => {
+      if (answerSent) return;
+      answerSent = true;
+      const answerKey = `rp2p_answer_${code.toUpperCase()}_${this.myPeerId}`;
+      localStorage.setItem(answerKey, JSON.stringify({ id: this.myPeerId, s: signal }));
+    });
+
+    peer.on('connect', () => {
+      this.connections.set(remoteId, peer);
+      peer.send(JSON.stringify({ type: 'identity', peerId: this.myPeerId }));
+      if (this.onpeerconnect) this.onpeerconnect(remoteId);
+    });
+
+    peer.on('data', data => {
+      try {
+        const msg = JSON.parse(data.toString());
+        this._handleMessage(msg, peer);
+      } catch (e) { console.error('p2p data error:', e); }
+    });
+
+    peer.on('close', () => this._cleanupPeer(peer));
+    peer.on('error', err => console.error('p2p error:', err));
+
+    peer.signal(offer);
+    this.connections.set(remoteId, peer);
+    this._pendingPeer = { peer, peerId: remoteId, connected: answerSent };
+  }
+
   /* ─── Mesh helpers ─── */
 
   _createSimplePeer(initiator, onSignal, onConnect) {
-    const peer = new SimplePeer({ initiator, trickle: false });
+    const peer = new SimplePeer({ initiator, trickle: false, config: { iceServers: [] } });
 
     peer.on('signal', signal => {
       if (onSignal) onSignal(signal);
@@ -339,7 +444,12 @@ class MeshNet {
     return this.connections.size;
   }
 
+  getFullSDPData() {
+    return this._fullSDPData;
+  }
+
   destroy() {
+    this._stopAnswerPolling();
     for (const peer of this.connections.values()) {
       try { peer.destroy(); } catch (e) {}
     }
diff --git a/style.css b/style.css
index 1804cd9..1bcfcd7 100644
--- a/style.css
+++ b/style.css
@@ -326,5 +326,86 @@ h3 {
   .coin.large .coin-face { font-size: 3rem; }
 }
 
+/* Debug helpers (visible only in ?debug mode) */
+.debug-only { display: none; }
+.debug-mode .debug-only { display: revert; }
+
+.debug-helper {
+  margin-top: 12px;
+  text-align: left;
+  font-size: 0.8rem;
+}
+.debug-helper summary {
+  cursor: pointer;
+  color: var(--text-dim);
+}
+.debug-helper summary:hover {
+  color: var(--text);
+}
+.raw-data {
+  margin-top: 6px;
+  padding: 8px;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  font-family: monospace;
+  font-size: 0.7rem;
+  word-break: break-all;
+  white-space: pre-wrap;
+  color: var(--text-dim);
+  max-height: 100px;
+  overflow: auto;
+}
+.debug-helper textarea {
+  width: 100%;
+  margin-top: 6px;
+  padding: 8px;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  color: var(--text);
+  font-family: monospace;
+  font-size: 0.75rem;
+  resize: vertical;
+}
+.btn-small {
+  margin-top: 6px;
+  padding: 6px 12px;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--bg-card);
+  color: var(--text);
+  cursor: pointer;
+  font-size: 0.75rem;
+}
+.btn-small:hover {
+  background: var(--bg-hover);
+}
+
+/* Room code (debug mode) */
+.room-code {
+  margin: 16px 0;
+  text-align: center;
+}
+.room-code-label {
+  display: block;
+  font-size: 0.8rem;
+  color: var(--text-dim);
+  margin-bottom: 4px;
+}
+.room-code-value {
+  display: inline-block;
+  font-family: 'Courier New', monospace;
+  font-size: 2.5rem;
+  font-weight: 800;
+  letter-spacing: 6px;
+  color: var(--gold);
+  background: var(--bg-card);
+  border: 2px dashed var(--border);
+  border-radius: var(--radius);
+  padding: 8px 24px;
+  user-select: all;
+}
+
 /* Utility */
 .hidden { display: none !important; }